Welding system.



J. A. SEEDE.

WELDING SYSTEM.

APPLICATION FILED SEPT. I2, I917- 1,%89,982 Patented Dec. 31,1918.

Inventor-z John 9 f. eede,

His fittior'neg.

JOHN A. SEEDE, or

WELDING arc may 'be supplied with current vfrom a device having an,-inherent regulating characteristie suitable for welding; while avoidmg the deleterious efi'ect of an initial rush of current prior to the establishment of -be pointed out with greater welding conditions,

. In accordance with my invention; an energy-consuming device, preferably a resistance, is included in the welding circuit prior to the establishment of aQwelding' arc, and

means is provided for automatlcally re-' moving said device from the weldingcircuit when the weldiug-arcis established. My invention also includes in one of its aspects a welding system provided with a constant current generator having a separately excited field winding which is energized simultane'ously with the insertion of a resistance in the shunt field winding upon the flow of welding current. This switching operation also activates coil controlling a serles resistance. The novel features will v particularity in the accompanying claims. -'In the accompanying drawing, Figure 1"v shows differentially wound direct current generator feeding a welding circuit and provlded with a resistance which is auto- 'matically short-circuited upon the flow ofwelding current, and Fig. 2 shows a con stant current generator provided with a ing system embodying my m'ventlon.

separately excited field'supplying a weld- Referring to Fig. 1,-the welding electrodes 1 and 2 are connected by conductors 3 and 4 to a difi'erentially-wound. welding generator having an armature 5, a shunt field 6, arida series field 7. At the instantwhen current flow is established there is considerable energy stored within the'generator which at the moment of starting the are would be dissipated explosively in the arc. However, in accordancewith my in-. vention there is included in circuit with ,specifieati'onof, Letters Patent. Patented Dec.

' system.

"welding arc.

- oomr'nuy, A conroRArIoN or NEW YORK.

Application flled September- 12,1917. Serial No. 190335. I

the conductor 3 an impedance 8 which suppresses the initial rush of electric energy.'

- x s; emit mama orat on-.

'sonnufacrnjax, EWYORK; ASSIGNOB TO GENERAL-ELECTRIC Current flow" also immediately energizes the winding of a series magnet 9 which'picks up its' armature 10 and short circuits the impedance ,8 through conductor .11 andthereupon the egulation of the welding arc is entirely carried out by the inherent constant current'characteristics of the generator.- Although a resistance has been shown in Fig. l for the purpose of illustration a reactance may be similarly 'used 111' either .In the system shown in Fig. 2, the weld- .ing electrodes 1, 2,are connected by conductor-s3; 4, to a generator having an armature 5, a shunt field winding -6,and a-separatcly excited field winding 12. In series with. the" shunt winding 6 is an adjustable resistance" 13 which at the beginning of-the operation is short circuited by the conductors 14 and- 15. Included in circuit with these conduc; tors is a' contactor 16 connected to the armature of a magnet 17, the winding of which is in series with the welding supply conductor 3. Upon the flow of the welding current the magnet17 picks up its armature, opening the short-circuit about the resistance 13 and thereby decreasing the flow of current. through the winding 6. At the :same time the contactor 16 connects the" winding 12 to a separate source of current represented in this case by supply mains19 and the contact 18 completes a circuit through a magnet 20. The magnet 20 is connected to one pole of the separate source of current 19, through conductors 21, 22 and to the other pole by the conductors 2 3 and 24.

An adjustable resistance 25 in circuit withthe conductor 24-serves to regulate the flow of current both through the separately excited field 12 and the magnet 20.

- The result of this switching operation is to weaken'the winding 6 byintroducing the re-' sistance 13, to supplement the weakenedrloo winding by meansof the separately excited winding 12 and to close a switch .25, shortcircuitingthe resistance 8 in .series with the Therefore, in this system as well as in the system described in connection with Fig. 1, an initial rush of energy is presupplied with substantially constant current.

vented in the welding are which is thereafter;

I am'aware it has been proposed to, place a 1 series resistance in circuit with a welding are, supplied with current from a constant,

of the welding are are -compensated by the inherent regulation of the 'source of supply.

What I claim as new and desire to secure by Letters Patent of the United States, is

' 1.. A welding system comprising the combination of welding electrodes, an energy supplying device connected to said electrodes havin an inherent regulating characteristic'suita le for welding, a currentcon'- suining device in said welding circuitnand means for automatically removing said de- I vice when a welding arc has been struck:

2. welding system comprising the combination of welding electrodes, a generator having an inherent regulating characteris-,,

.tic suitable for arc Welding electrically connected to supply said electrodes with current, an impedance in circuit with said electrodes and automatic means for removing said impedance when a welding arc has been formed, 3. A welding system comprising the combination of welding electrodes, 2. generator havingan inherent regulating characteristic suitable for arc welding connected to said electrodes, a'resistance in circuit with said electrodes, and means responsive to current.

flow in said'circuit for short-circuiting said resistance. I

4. A welding system,'comprisi ng the combination of welding electrodes, an electric generator for supplying said electrodes with substantially constant current, a shunt-connected field winding for said generator, a second field winding, a separate source of excitation therefor, a resistance, means responsive to a flow of current for inserting said resistance in circuit with said shunt field and simultaneously connecting said second field winding to said separate source, a resistance in circuit with said weldin electrodes, and means responsive to a ow' of welding current to remove said resistance.

5. A weldingl-system comprising the com.

bination of we ding electrodes, a generator electrically connected thereto having a shunt field winding, a short-circuited resistance connected thereto, a second accumulative field winding, a resistance in circuit with said welding electrodes, "a short-circuiting switch for said resistance and switching means responsive to flow of welding current for including the shunt windin in circuit with said winding an energizing both said second field winding and said shortcircuiting switch for the resistance in the' welding circuit.

resistance In witness whereof, I have hereunto set my I September 1917.

hand this 10th day of JOHN A. S'EEDE. 

